Quick question about 2 buttons on top of one another

I have Button1 that covers the entire background of my Flash movie, and when this button is rolled over a movieclip, that contains Button2, appears on the stage. And in turn, when the used rolls out of Button1, the movieclip disappears again. The problem I’m having is that when the mouse rolls over Button2, this causes the ‘disappear’ action on Button1 run.

So… my quick question is, how does one enable Button2s actions, while retaining the state of Button1?

Make sense? Hope so. Thanks in advance.